AI 中文总结
针对VANETs中状态信息新鲜度维持问题，提出A-CB策略及两种TA-CB策略，经实验验证其性能优于非协作广播，簇状拓扑下TA-CB较A-CB有大幅提升
AI 中文摘要
在车载自组织网络（VANETs）中，维持车辆间状态信息的新鲜度对于实现及时可靠的安全相关决策至关重要。本文研究VANETs中的协作状态广播调度问题，其中车辆不仅允许广播自身更新，还可广播其他车辆的更新。我们提出了年龄感知协作广播（A-CB）策略，由路侧单元（RSU）基于发送者网络链路上可实现的总年龄增益来调度目标-发送者对。此外，通过利用网络拓扑，我们引入两种感知拓扑与节点年龄的协作广播（TA-CB）策略：Local TA-CB根据第二跳邻居数量对链路进行加权，Global TA-CB则利用车辆的介数中心性来优先安排广播决策。所提策略在随机和簇状网络拓扑下均进行了评估，数值结果表明协作策略显著优于非协作广播；值得注意的是，在簇状网络结构中，Local TA-CB和Global TA-CB策略较A-CB实现了大幅性能提升，且二者在不同网络条件下各有优劣。
英文摘要
In vehicular ad-hoc networks (VANETs), maintaining the freshness of status information among vehicles is critical for enabling timely and reliable safety-related decisions. In this paper, we consider the problem of scheduling cooperative status broadcasting in VANETs, where vehicles are allowed to broadcast not only their own updates but also the updates of other vehicles. We propose the age-aware cooperative broadcasting (A-CB) policy, in which a road-side unit (RSU) schedules target-sender pairs based on the total achievable age-gain over the sender's network links. Moreover, through exploiting the network topology, we introduce two topology-age-aware cooperative broadcasting (TA-CB) policies; the Local TA-CB that weights links according to the number of second-hop neighbors, and the Global TA-CB that leverages the betweenness centrality of vehicles to prioritize broadcasting decisions. The proposed policies are evaluated under both random and clustered network topologies. Numerical results demonstrate that cooperative policies significantly outperform non-cooperative broadcasting. Notably, in clustered network structures, the Local and the Global TA-CB policies achieve substantial improvements over A-CB, with each outperforming the other under different network conditions.
